Spring used in venetian blinds



FIG. 1 is a side elevational view of a spring used in venetian blinds showing my new design, the opposite side being a mirror image thereof;

FIG. 2 is a front elevational view of FIG. 1, the rear being a mirror image thereof; and,

FIG. 3 is a perspective view of FIG. 1.

The spring has no substantial thickness. 

The ornamental design for a spring used in venetian blinds, as shown and described. 